Classic motorcycles built before 2001 appear to be outside proposed new emissions rules, but owners of more recent machines could face tougher restrictions on modifications and maintenance.
The Department for Transport is consulting on a major change to the law governing emissions from vehicles already on Britain’s roads, and for motorcyclists there is one date worth remembering: 1 January 2001.
The Government proposes updating Regulation 61A of the Road Vehicles (Construction and Use) Regulations so that vehicles within its scope from that date must have their emissions-control systems maintained to continue meeting the requirements that applied when they were manufactured.
That is potentially significant for motorcycles because bikes have never previously been covered by Regulation 61A.
The Government now proposes bringing Category L vehicles – motorcycles, scooters, mopeds, tricycles and quadricycles – within the regulation.
For owners of genuinely old classic motorcycles, however, the 2001 cut-off is the important part. A 1950s BSA Gold Star, 1960s Triumph Bonneville or 1970s Honda CB750 appears to be outside the scope of this particular proposal.
It’s the growing population of modern classics from 2001 onwards where things become more interesting.
Why motorcycles are being included
Current Regulation 61A applies to cars, vans, lorries, trucks, buses and coaches, but not motorcycles. The DfT now sees no reason for that distinction to continue.
Curiously, it also admits the evidence isn’t particularly strong.
“We have limited analytical evidence specific to in-use emissions from motorcycles,” says the consultation.
Nevertheless, because motorcycles have the potential to contribute to excess emissions, the DfT says it has found no clear policy or technical reason to leave them out of the updated regulation.
That could prove one of the more contentious parts of the consultation, particularly since many post-2001 motorcycles are already regarded as classics and modification is hardly unusual.
Your aftermarket exhaust isn’t automatically illegal
The proposals do not amount to a blanket ban on modifying motorcycles.
The DfT specifically says: “We are not seeking to prohibit all vehicle modifications.”
It describes modification as a legitimate activity embraced by enthusiasts, tuners and repairers, and isn’t proposing that owners should be forced to use original manufacturer parts.
Instead, the important question would be whether a modification results in a vehicle no longer complying with the emissions standard to which it was originally approved.
That distinction could become particularly important for motorcycles fitted with aftermarket exhaust systems, altered emissions equipment or ECU remaps.
The DfT says both hardware and software modifications could be caught and, importantly, an increase in emissions doesn’t have to be intentional.
For other vehicles, the consultation specifically identifies catalytic-converter removal, particulate-filter deletion, AdBlue deletion and EGR manipulation as modifications known to result in illegal emissions.
The document does not, however, say that fitting an aftermarket motorcycle exhaust is automatically unlawful. The issue is whether the modification causes the bike to cease complying with its original emissions requirements.
The 2001 dividing line
For the classic motorcycle world, this is where the proposal becomes particularly interesting.
A bike from before 2001 appears to remain outside this particular Regulation 61A regime, even if it is still being used regularly on the road. Existing rules covering such things as motorcycle exhaust systems and roadworthiness would continue to apply, but the new lifetime emissions requirement proposed here is aimed at vehicles from 1 January 2001.
Move into the 21st century, however, and the situation changes.
Motorcycles built in the early 2000s are now approaching or beyond 25 years old. They’re increasingly being bought, restored and collected as classics, yet under the proposal they could also be expected to retain and maintain the emissions equipment required when they were new.
That could make the legislation relevant to an entirely new generation of classic motorcycles.
Maintenance could matter as much as modification
The proposals aren’t aimed solely at people deliberately removing emissions equipment.
The Government doesn’t intend to distinguish between excessive emissions caused by poor maintenance and those caused by modification. Nor does it propose separating deliberate modifications from unintentional ones, arguing that the environmental effect is the same.
There would be exemptions, including certain faults outside an owner’s control and circumstances where a vehicle is being driven to have its emissions-control equipment repaired.
The DVSA is expected to enforce the new rules. The DfT says annual roadworthiness testing has limited ability to assess emissions systems, so enforcement is likely to concentrate further upstream on businesses involved in illegal emissions modifications.
The Government expects the legislation to be passed in summer 2027, followed by a proposed six-month adjustment period. The consultation itself closes at 11.59pm on 6 September 2026. Click here to take part.
For most traditional classic-bike owners, then, the message is reassuring: the 2001 cut-off means your old Norton, Triumph, BSA, Velocette, Ducati or Honda isn’t suddenly going to be expected to meet modern emissions standards.
But the definition of a classic keeps moving forward. And for the increasingly desirable generation of motorcycles built after 1 January 2001, the Government’s proposals could make retaining their original emissions equipment rather more important than it has been until now.
